When we meet new people who work with verifications, we’ve noticed that they often find their verifications difficult and time-consuming. The mere idea of starting a verification makes their shoulders…
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Total error and measurement uncertainty
In the end, what matters in a laboratory, is how reliable we can expect a single measured result to be. How do we estimate the effect that all possible error…
To rerun or not to rerun – the common what ifs of qualitative comparisons
We recently introduced qualitative comparisons, giving some essential tips on how to do them right. But we’ve seen that some laboratories prefer to mix things up, and that they typically…
How to compare qualitative tests – essential tips for running your verifications
Lately we’ve been discussing about comparison studies for tests that produce quantitative results. But how about tests that give qualitative results? Similarly as with quantitative tests, we can do comparisons…
How to take Validation Manager into use?
Validation Manager makes verifications easy. Yet for some people it may seem like an overwhelming task to start using it. Nevertheless, we are confident that shaping up your verifications doesn’t…
Why your laboratory should never use ordinary linear regression in method comparisons & what to do instead
A few weeks ago we discussed how to estimate the average bias over the whole measuring range. We also discussed how to recognize situations where the average bias gives enough…
Setting up your big verifications in Validation Manager (simple but essential tips)
Users who are new to Validation Manager often ask us for a recommendation on how to organize their oncoming big verification in Validation Manager. This is a very good question…
How to estimate average bias & use Bland-Altman comparison – tips & examples
Last year we discussed the overall idea of bias in our blog post what you measure when you measure bias. Lately we’ve realized that there is need for a more thorough…
Want to climb up the laboratory quality ladder? Automated verification reporting is the first step
We recently introduced the concept of quality steps in our blog. To make it more concrete and give you some ideas on how to climb up the steps, let’s discuss…
The most common mistake laboratories make with correlation coefficient (and how to fix it)
Discussions with many of our customers have revealed that when a laboratory compares two methods or instruments as part of their verification, they usually calculate the correlation coefficient. If we…
